Chevreux, 1908
Body slender, compressed, smooth (Eusirella elegans 1; Eusirella multicalceola 1). Rostrum small. Eyes absent. ANT with numerous calceoli in both sexes (Eusirella multicalceola 3). ANT I longer than II. ART 1 of peduncle of ANT I as long as head; ART 2 longer than 1, ART 3 very short; accessory flagellum scale-like, uni-articulate, or absent (Eusirella flagella 2). Flagellum of ANT II much shorter than peduncle. Molar poorly triturative or simple, subconical. Inner lobe of MX I without setae, palp short, ART 1 longer than 2. Inner lobe of MX II broader but not longer than outer. Lower lip with inner lobes. Coxae very short, CX IV without posterior lobe, not excavated. P I and II not of eusirid form, strongly subchelate, ART 5 without posterior lobe. ART 6 of P I lanceolate (Eusirella flagella 1; Eusirella multicalceola 2). P II larger than P I, ART 6 elongate, almost linear. Palms of P I and II almost as long as posterior margins of ART 6, with palmar spines. P III-VII elongate, simple. Epimeral plate III with smooth margins. Exopodites of UR I-III shorter than endopodites; rami with lateral and dorsal spines. Telson elongate, cleft. Purely pelagic genus.
Five species, 3 in the South Atlantic:
Eusirella elegans Chevreux, 1908
Eusirella flagella Andres, 1982
Eusirella multicalceola (Thorsteinson, 1941)